Thanks for report, the same could be done for every single coreutils utility ... except true and false - where it was fixed because of https://bugzilla.redhat.com/show_bug.cgi?id=537684 ;) .
"set_program_name (argv[0] ? argv[0] : PROGRAM_NAME);" instead of "set_program_name (argv[0]);" in every single coreutils source file could solve the problem...
Upstream maintainer stated in http://marc.info/?l=coreutils-bug&m=125832075427611&w=2 that he still haven't decided how to accomodate this. Therefore adding him to CC to check if the comment is still valid.

Ah, ok, sorry for confusion, Jim ... confirmed - diagnostic is present in coreutils-8.5 (now in Rawhide) and in coreutils-8.4 (to be in F-13) ... I do not plan to backport diagnostics into F-12 at the moment - as this is misuse of execve. Closing NEXTRELEASE.

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